Composition Inhomogeneity due to Alkaline Volatilization in Li‐Modified (K, Na)NbO3 Lead‐Free Piezoceramics
Composition Inhomogeneity due to Alkaline Volatilization in Li‐Modified (K, Na)NbO3 Lead‐Free Piezoceramics
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DOI：
10.1111/jace.12497
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发表时间：
2013-09
影响因子：
3.9
通讯作者：
Li-Qian Cheng;Ke Wang;Fang-Zhou Yao;F. Zhu;Jingfeng Li
中科院分区：
文献类型：
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作者：
Li-Qian Cheng;Ke Wang;Fang-Zhou Yao;F. Zhu;Jingfeng Li
在（K, Na）NbO3 （KNN）基无铅压电陶瓷中，烧结过程中的碱性挥发是导致非化学计量的一个问题，从而影响了相结构和性能。本文利用x射线光电子能谱和拉曼光谱研究了锂改性KNN陶瓷中碱性元素的深度依赖分布。结果表明，Li的蒸发比Na和K更严重，烧结后表面几乎没有Li元素残留，而在距最外表面55 μm以上的深度内Li元素含量趋于稳定。此外，x射线衍射结果表明，由于表面颗粒的织构，颗粒表面与内部的相结构可能存在差异。
Alkaline volatilization during sintering in (K, Na)NbO3 (KNN)-based lead-free piezoceramics is a problem that causes non-stoichiometry and hence affects the phase structures and properties. This work investigated the depth-dependent distributions of alkaline elements in Li-modified KNN ceramics using X-ray photoelectron spectroscopy and Raman spectroscopy. It was found that Li evaporated more severely than Na and K, consequently almost no Li elements remained on the as-sintered surface, while its content became stable at the depth over 55 μm from the outmost surface. In addition, X-ray diffraction results suggested the phase structure might show discrepancy at the pellet surface and the interior part due to the textured surface grains.